Fire-alarm device.



N0. 675,066. Pat ented ma 2 ,1901.

N. MALLANDER.

FIRE ALARM DEVICE. (A unuon 81 d m 21, 1 00.

' (No Model.) -2 Sheets-Sheet I.

Kati 2166666 I fu/enibrr THE Norms PErzns 00., Puu'wm'ua. WASHINGTON n c No. 675,066. Patented llay 28, I90l.

' N MALLA NDER FIRE ALARM DEVICE. (Applicatibn filed may 21, 1900.)

2 Sheets-Sheet 2 (No Model) UNITED" STATES PATENT @FFIQE NELS MALLANDER, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF THREE- FOURTHS TO WILLIAM'H. KAERCHER, JOHN A. OLSON, AND WILLIAM JOHNSON, OF SAME PLACE.

FIRE-ALARM DEVICE.

SPECIFICATION forming part of Letters Patent No. 675,066, dated May 28, 1901.

Application filed May 21, 1900. berial No. 17,350. (No model.)

1'0 00M whom it may concern.-

Be it known that I, NELS MALLANDER, a citizen of the United States, residing at Minneapolis, in the county of Hen nepin and State of Minnesota, have invented certain new and useful Improvements in Fire-Alarm Devices; and I do hereby declare the following to be a full, clear, and exact description of the illvention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its especial object to provide an improved automatic fire-alarm device, but is nevertheless capable of use either in a fire-alarm or automatic fire-extinguishi ng system.

To the ends above indicated, the invention consists of the novel devices and combinations of devices hereinafter described, and defined in the claims.

The invention is illustrated in the accompanying drawings,wherein like characters indicate like parts throughout the several views.

Figure l is a front elevation showing the complete device in its preferred form. Fig. 2 is an enlarged view, in front elevation, showing the internal mechanism of the thermometer or thermoscope, the dial or face of the device being removed; and Fig. 3 is a horibox-like base 2, having,preferably, a hinged lid 3. Within the box 2 is located a battery 2, which may be of any suitable form, but is advisably a dry battery. Secured to the backboard 1 is an ordinary electrically-actuated bell or gong 4. and the case 5 ol' the thermometer, which case, as shown, is of cylindrical form and is provided with a graduated dial 6, held in place by a telescoping retaining-riugorannularkeeper7. Thisthermome- 'ter or thermoscope, except as hereinafter specified, is of standard construction, such as is foundon the market, and the vital parts thereof will therefore be briefly noted. To an oscillating spindle or shaft 8, suitably mounted within the case 0, is a pointer or dial-finger 9, which works over the radna- .post of bracket 11, secured to the case 5, and

one end thereof is connected by a pronged head 12 and a pair of wires or cords 13 to the oscillating shaft 8. Thus it will be understood that the movements of the ring 10 and parts carried thereby under varying temperatures will move the pointer 9 over the graduations of the dial 6 to indicate the temperature of the air in the vicinity of the instrument. In applying my invention to this thermomeler or thermoscope I cut a segmental slot in the dial 6, as indicated at 14. This slot 14 may be of any desired extent; but for ordinary purposes it need be extended only from about the fifty-degree mark to the onehundred-and-twenty-degree mark; One wire 2 extends from the battery 2 to av metallic bearing 15, which has electrical contact with the oscillating shaft 8, so that the finger 9 becomes an electrode;- The other wire a from the battery 2 extends directly to the bell 4, and from the bell a section 2 of the wire 2' extends into the case 5, being insulated therefrom, and is attached to one end of an adjustable contact-piece or electrode 16. The contact-piece 16 is shown as in the form of a curved rod provided at its inner end with a pair of contact-points 17 and 18, spaced apart preferably about four or five degrees, as indicated by the graduations on the dial. The contact-points l7 and 18 work through the segmental slot 14 and embrace the point of the pointer or finger 9. The outer end of the rod 16 works through an insulating-bushing 19, preferably of soft 'rnbber, which is suitably secured in a sleeve 20 of the case 5vand serves to frictionallyhold the said rod or. electrode lo wherever set. At its outer end said rod '16 is preferably provided with a fingerpiece 21, by means of which it maybe readily adjusted. o

The action of the above-described device will be substantially as follows: Suppose, for instance, that the maximum temperature to be permitted in a room without sounding the alarm be 100. In this case the contactpoint 17 of the electrode l6 would be set at 100, in which case when the temperature of 100 is reached the circuit between the battery and the bell will be closed by the contact of the finger 9 with the said point 17, so that the bell will be sounded and the alarm given. V

Of course if this device is to be placed in a cold building-in the wintertime, for instance-it could be set for action at a very much lower temperature, so that a fire, if started, would cause the alarm to be sounded as soon as the temperature was raised but very slightly above the normal. Hence it is obvious that this device may be set for action as soon as the temperature of any room is raised slightly above the temperature which it is assu med or determined will be maintained therein under normal conditions.

When used simply for a fire alarm or signal, the contact-point 18 might be dispensed with. However, it is often desirable to use such a device in places where it is important to know when the temperature falls below or rises above a certain point, in which case the pair of contact-points are necessary or desirable in one form or the other. Such an action is desirable, for instance, in coldstorage buildings. It might also be used in connection with incubators,where it is necessary to keep the temperature within the limits of a few degrees of variation. Further' more, the automatic closing of the circuit between the finger 9 and the cooperating electrode or contact instead of actuating a bell might actuate a trip-magnet, and hence it stance, as in automatic fire-extinguishing systems. It will also be understood that the bell or alarm device may be located at any ;point and at any'distance from the controlling mechanism. Again, it should be understood that my invention is not limited to application to' any particularform of thermometer or thermoscope.

1 WhatI claim, and desire to secure by Letters Patent of the United States, is as follows 1. The combination with 'a thermometer comprising a case, a graduated dial, and a movable finger or pointer, of an adjustable including said finger or pointer and said ad justable electrode, said parts operating substantially as'described.

' 2. The combination with a thermometer comprising a case, a graduated dial and a movable finger or pointer, of an adjustable electrode mounted for adjustments within said case, said electrode cooperating with said pointer and having a part projecting through a slot of said dial, to indicate its position, a stem projecting from said movable electrode and mounted to slide endwise outward through the seat or perforation in the margin of said case, and circuit connections comprising an alarm or bell and a battery or source of energy, and including said finger or pointer and said adjustable electrode, substantially" as described.

In testimony whereof I affix my signature I 

